A polling agency conducted a survey of 100 doctors on the question: "Are you willing to treat women patients with the recently approved pill RU-486?" The conservative margin of error associated with the 95% confidence interval for the percent who say 'yes' is
A) 50%.
B) 10%.
C) 5%.
D) 2%.

Question

Quizplus · Accepted Answer

The margin of error in a survey is influenced by the sample size and the confidence level. For a sample size of 100 and a 95% confidence level, a common approximation for the margin of error is around 10%. This is because the maximum margin of error for a proportion (when p=0.5) using a 95% confidence level is approximately 1/sqrt(n), where n is the sample size. For n=100, this calculation gives us about 0.1 or 10%.

A Polling Agency Conducted a Survey of 100 Doctors on the Question